Create thread:
You cant create threads until a day or so after your account has been created ... "[i]Why[/i]" you may ask?
One of bungies many stupid rules - bungies mantra is "[i]you have no rights[/i]", untrue but they do their best to enact that hope :(
Replay everything:
Yeah, noticed that too, and your are right with the "[i]little replay value[/i]" comment. Guess the install overwrites the game play history ... and if thats gone you have no other choice (well, other than not play).
Guessing for $0.99 somethings gotta give.
Check back in a few days - someone else may of had better luck. May be better to quiz HBS (original developers) rather than post here.

CREATE THREAD DONT WORK
OK - am posting this here becasue the 'create thread' process doesnt work. The 'how to' guide says that a create thread option should appear above forum topics on the right hand side. It doesnt on my ipad and it doesnt on my PC. I hope devs read this forum.
HOW DO I AVOID HAVING TO REPLAY EVERYTHING WHEN UPGRADING?
So I upgraded crimson pirates and my ios and found CP didnt recognise my purchase of chapter 2 - I almost walked away, but after much digging around on forums found where to go to get it recognised again. I then purchase Chapter 3, but find the game has reset so all Chapter 1&2 missions are locked. SO if I want to play chapter 3 it seems that I have to replay everything to get there. This aint a good look in a game where several reviewers note the missiions 'have little replay value'. Anyone know how I can get the game to unlock chaps 1 & 2? Just thinking about it, I imagine this will also be an issue for people who uninstall/reinstall the game, do a ipad reset etc.

[url=http://www.bungie.net/Account/Profile.aspx?memberID=109422]DeeJ[/url] appears to have taken up some of the slack created by bungies '[i]publisher[/i]' efforts.
Check out some of his posts, may be a few codes remaining.
Guessing they are once off codes and that the PR budget s restricted ... better be quick.